698 lines
20 KiB
C++
698 lines
20 KiB
C++
/*************************************************************************/
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/* networked_multiplayer_enet.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md) */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "networked_multiplayer_enet.h"
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#include "io/marshalls.h"
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#include "os/os.h"
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void NetworkedMultiplayerENet::set_transfer_mode(TransferMode p_mode) {
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transfer_mode = p_mode;
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}
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void NetworkedMultiplayerENet::set_target_peer(int p_peer) {
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target_peer = p_peer;
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}
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int NetworkedMultiplayerENet::get_packet_peer() const {
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ERR_FAIL_COND_V(!active, 1);
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ERR_FAIL_COND_V(incoming_packets.size() == 0, 1);
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return incoming_packets.front()->get().from;
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}
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Error NetworkedMultiplayerENet::create_server(int p_port, int p_max_clients, int p_in_bandwidth, int p_out_bandwidth) {
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ERR_FAIL_COND_V(active, ERR_ALREADY_IN_USE);
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ENetAddress address;
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#ifdef GODOT_ENET
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if (bind_ip.is_wildcard()) {
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address.wildcard = 1;
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} else {
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enet_address_set_ip(&address, bind_ip.get_ipv6(), 16);
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}
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#else
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if (bind_ip.is_wildcard()) {
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address.host = 0;
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} else {
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ERR_FAIL_COND_V(!bind_ip.is_ipv4(), ERR_INVALID_PARAMETER);
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address.host = *(uint32_t *)bind_ip.get_ipv4();
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}
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#endif
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address.port = p_port;
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host = enet_host_create(&address /* the address to bind the server host to */,
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p_max_clients /* allow up to 32 clients and/or outgoing connections */,
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SYSCH_MAX /* allow up to SYSCH_MAX channels to be used */,
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p_in_bandwidth /* assume any amount of incoming bandwidth */,
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p_out_bandwidth /* assume any amount of outgoing bandwidth */);
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ERR_FAIL_COND_V(!host, ERR_CANT_CREATE);
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_setup_compressor();
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active = true;
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server = true;
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refuse_connections = false;
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unique_id = 1;
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connection_status = CONNECTION_CONNECTED;
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return OK;
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}
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Error NetworkedMultiplayerENet::create_client(const IP_Address &p_ip, int p_port, int p_in_bandwidth, int p_out_bandwidth) {
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ERR_FAIL_COND_V(active, ERR_ALREADY_IN_USE);
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host = enet_host_create(NULL /* create a client host */,
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1 /* only allow 1 outgoing connection */,
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SYSCH_MAX /* allow up to SYSCH_MAX channels to be used */,
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p_in_bandwidth /* 56K modem with 56 Kbps downstream bandwidth */,
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p_out_bandwidth /* 56K modem with 14 Kbps upstream bandwidth */);
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ERR_FAIL_COND_V(!host, ERR_CANT_CREATE);
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_setup_compressor();
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ENetAddress address;
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#ifdef GODOT_ENET
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enet_address_set_ip(&address, p_ip.get_ipv6(), 16);
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#else
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ERR_FAIL_COND_V(!p_ip.is_ipv4(), ERR_INVALID_PARAMETER);
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address.host = *(uint32_t *)p_ip.get_ipv4();
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#endif
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address.port = p_port;
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//enet_address_set_host (& address, "localhost");
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//address.port = p_port;
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unique_id = _gen_unique_id();
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/* Initiate the connection, allocating the enough channels */
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ENetPeer *peer = enet_host_connect(host, &address, SYSCH_MAX, unique_id);
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if (peer == NULL) {
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enet_host_destroy(host);
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ERR_FAIL_COND_V(!peer, ERR_CANT_CREATE);
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}
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//technically safe to ignore the peer or anything else.
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connection_status = CONNECTION_CONNECTING;
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active = true;
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server = false;
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refuse_connections = false;
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return OK;
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}
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void NetworkedMultiplayerENet::poll() {
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ERR_FAIL_COND(!active);
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_pop_current_packet();
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ENetEvent event;
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/* Wait up to 1000 milliseconds for an event. */
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while (true) {
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if (!host || !active) //might have been disconnected while emitting a notification
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return;
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int ret = enet_host_service(host, &event, 1);
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if (ret < 0) {
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//error, do something?
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break;
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} else if (ret == 0) {
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break;
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}
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switch (event.type) {
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case ENET_EVENT_TYPE_CONNECT: {
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/* Store any relevant client information here. */
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if (server && refuse_connections) {
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enet_peer_reset(event.peer);
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break;
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}
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int *new_id = memnew(int);
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*new_id = event.data;
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if (*new_id == 0) { //data zero is sent by server (enet won't let you configure this). Server is always 1
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*new_id = 1;
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}
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event.peer->data = new_id;
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peer_map[*new_id] = event.peer;
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connection_status = CONNECTION_CONNECTED; //if connecting, this means it connected t something!
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emit_signal("peer_connected", *new_id);
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if (server) {
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//someone connected, let it know of all the peers available
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for (Map<int, ENetPeer *>::Element *E = peer_map.front(); E; E = E->next()) {
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if (E->key() == *new_id)
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continue;
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//send existing peers to new peer
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ENetPacket *packet = enet_packet_create(NULL, 8, ENET_PACKET_FLAG_RELIABLE);
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encode_uint32(SYSMSG_ADD_PEER, &packet->data[0]);
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encode_uint32(E->key(), &packet->data[4]);
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enet_peer_send(event.peer, SYSCH_CONFIG, packet);
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//send the new peer to existing peers
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packet = enet_packet_create(NULL, 8, ENET_PACKET_FLAG_RELIABLE);
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encode_uint32(SYSMSG_ADD_PEER, &packet->data[0]);
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encode_uint32(*new_id, &packet->data[4]);
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enet_peer_send(E->get(), SYSCH_CONFIG, packet);
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}
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} else {
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emit_signal("connection_succeeded");
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}
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} break;
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case ENET_EVENT_TYPE_DISCONNECT: {
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/* Reset the peer's client information. */
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int *id = (int *)event.peer->data;
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if (!id) {
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if (!server) {
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emit_signal("connection_failed");
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}
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} else {
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if (server) {
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//someone disconnected, let it know to everyone else
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for (Map<int, ENetPeer *>::Element *E = peer_map.front(); E; E = E->next()) {
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if (E->key() == *id)
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continue;
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//send the new peer to existing peers
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ENetPacket *packet = enet_packet_create(NULL, 8, ENET_PACKET_FLAG_RELIABLE);
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encode_uint32(SYSMSG_REMOVE_PEER, &packet->data[0]);
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encode_uint32(*id, &packet->data[4]);
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enet_peer_send(E->get(), SYSCH_CONFIG, packet);
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}
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} else if (!server) {
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emit_signal("server_disconnected");
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close_connection();
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return;
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}
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emit_signal("peer_disconnected", *id);
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peer_map.erase(*id);
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memdelete(id);
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}
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} break;
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case ENET_EVENT_TYPE_RECEIVE: {
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if (event.channelID == SYSCH_CONFIG) {
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//some config message
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ERR_CONTINUE(event.packet->dataLength < 8);
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// Only server can send config messages
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ERR_CONTINUE(server);
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int msg = decode_uint32(&event.packet->data[0]);
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int id = decode_uint32(&event.packet->data[4]);
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switch (msg) {
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case SYSMSG_ADD_PEER: {
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peer_map[id] = NULL;
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emit_signal("peer_connected", id);
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} break;
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case SYSMSG_REMOVE_PEER: {
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peer_map.erase(id);
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emit_signal("peer_disconnected", id);
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} break;
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}
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enet_packet_destroy(event.packet);
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} else if (event.channelID < SYSCH_MAX) {
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Packet packet;
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packet.packet = event.packet;
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uint32_t *id = (uint32_t *)event.peer->data;
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ERR_CONTINUE(event.packet->dataLength < 12)
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uint32_t source = decode_uint32(&event.packet->data[0]);
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int target = decode_uint32(&event.packet->data[4]);
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uint32_t flags = decode_uint32(&event.packet->data[8]);
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packet.from = source;
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if (server) {
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// Someone is cheating and trying to fake the source!
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ERR_CONTINUE(source != *id);
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packet.from = *id;
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if (target == 0) {
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//re-send the everyone but sender :|
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incoming_packets.push_back(packet);
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//and make copies for sending
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for (Map<int, ENetPeer *>::Element *E = peer_map.front(); E; E = E->next()) {
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if (uint32_t(E->key()) == source) //do not resend to self
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continue;
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ENetPacket *packet2 = enet_packet_create(packet.packet->data, packet.packet->dataLength, flags);
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enet_peer_send(E->get(), event.channelID, packet2);
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}
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} else if (target < 0) {
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//to all but one
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//and make copies for sending
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for (Map<int, ENetPeer *>::Element *E = peer_map.front(); E; E = E->next()) {
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if (uint32_t(E->key()) == source || E->key() == -target) //do not resend to self, also do not send to excluded
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continue;
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ENetPacket *packet2 = enet_packet_create(packet.packet->data, packet.packet->dataLength, flags);
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enet_peer_send(E->get(), event.channelID, packet2);
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}
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if (-target != 1) {
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//server is not excluded
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incoming_packets.push_back(packet);
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} else {
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//server is excluded, erase packet
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enet_packet_destroy(packet.packet);
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}
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} else if (target == 1) {
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//to myself and only myself
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incoming_packets.push_back(packet);
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} else {
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//to someone else, specifically
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ERR_CONTINUE(!peer_map.has(target));
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enet_peer_send(peer_map[target], event.channelID, packet.packet);
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}
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} else {
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incoming_packets.push_back(packet);
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}
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//destroy packet later..
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} else {
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ERR_CONTINUE(true);
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}
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} break;
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case ENET_EVENT_TYPE_NONE: {
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//do nothing
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} break;
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}
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}
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}
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bool NetworkedMultiplayerENet::is_server() const {
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ERR_FAIL_COND_V(!active, false);
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return server;
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}
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void NetworkedMultiplayerENet::close_connection() {
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if (!active)
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return;
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_pop_current_packet();
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bool peers_disconnected = false;
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for (Map<int, ENetPeer *>::Element *E = peer_map.front(); E; E = E->next()) {
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if (E->get()) {
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enet_peer_disconnect_now(E->get(), unique_id);
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peers_disconnected = true;
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}
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}
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if (peers_disconnected) {
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enet_host_flush(host);
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OS::get_singleton()->delay_usec(100); //wait 100ms for disconnection packets to send
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}
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enet_host_destroy(host);
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active = false;
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incoming_packets.clear();
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unique_id = 1; //server is 1
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connection_status = CONNECTION_DISCONNECTED;
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}
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int NetworkedMultiplayerENet::get_available_packet_count() const {
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return incoming_packets.size();
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}
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Error NetworkedMultiplayerENet::get_packet(const uint8_t **r_buffer, int &r_buffer_size) const {
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ERR_FAIL_COND_V(incoming_packets.size() == 0, ERR_UNAVAILABLE);
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_pop_current_packet();
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current_packet = incoming_packets.front()->get();
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incoming_packets.pop_front();
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*r_buffer = (const uint8_t *)(¤t_packet.packet->data[12]);
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r_buffer_size = current_packet.packet->dataLength - 12;
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return OK;
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}
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Error NetworkedMultiplayerENet::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
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ERR_FAIL_COND_V(!active, ERR_UNCONFIGURED);
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ERR_FAIL_COND_V(connection_status != CONNECTION_CONNECTED, ERR_UNCONFIGURED);
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int packet_flags = 0;
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int channel = SYSCH_RELIABLE;
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switch (transfer_mode) {
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case TRANSFER_MODE_UNRELIABLE: {
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packet_flags = ENET_PACKET_FLAG_UNSEQUENCED;
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channel = SYSCH_UNRELIABLE;
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} break;
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case TRANSFER_MODE_UNRELIABLE_ORDERED: {
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packet_flags = 0;
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channel = SYSCH_UNRELIABLE;
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} break;
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case TRANSFER_MODE_RELIABLE: {
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packet_flags = ENET_PACKET_FLAG_RELIABLE;
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channel = SYSCH_RELIABLE;
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} break;
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}
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Map<int, ENetPeer *>::Element *E = NULL;
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if (target_peer != 0) {
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E = peer_map.find(ABS(target_peer));
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if (!E) {
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ERR_EXPLAIN("Invalid Target Peer: " + itos(target_peer));
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ERR_FAIL_V(ERR_INVALID_PARAMETER);
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}
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}
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ENetPacket *packet = enet_packet_create(NULL, p_buffer_size + 12, packet_flags);
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encode_uint32(unique_id, &packet->data[0]); //source ID
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encode_uint32(target_peer, &packet->data[4]); //dest ID
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encode_uint32(packet_flags, &packet->data[8]); //dest ID
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copymem(&packet->data[12], p_buffer, p_buffer_size);
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if (server) {
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if (target_peer == 0) {
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enet_host_broadcast(host, channel, packet);
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} else if (target_peer < 0) {
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//send to all but one
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//and make copies for sending
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int exclude = -target_peer;
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for (Map<int, ENetPeer *>::Element *F = peer_map.front(); F; F = F->next()) {
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if (F->key() == exclude) // exclude packet
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continue;
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ENetPacket *packet2 = enet_packet_create(packet->data, packet->dataLength, packet_flags);
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enet_peer_send(F->get(), channel, packet2);
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}
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enet_packet_destroy(packet); //original packet no longer needed
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} else {
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enet_peer_send(E->get(), channel, packet);
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}
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} else {
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ERR_FAIL_COND_V(!peer_map.has(1), ERR_BUG);
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enet_peer_send(peer_map[1], channel, packet); //send to server for broadcast..
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}
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enet_host_flush(host);
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return OK;
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}
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int NetworkedMultiplayerENet::get_max_packet_size() const {
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return 1 << 24; //anything is good
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}
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void NetworkedMultiplayerENet::_pop_current_packet() const {
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if (current_packet.packet) {
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enet_packet_destroy(current_packet.packet);
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current_packet.packet = NULL;
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current_packet.from = 0;
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}
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}
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NetworkedMultiplayerPeer::ConnectionStatus NetworkedMultiplayerENet::get_connection_status() const {
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return connection_status;
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}
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uint32_t NetworkedMultiplayerENet::_gen_unique_id() const {
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uint32_t hash = 0;
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while (hash == 0 || hash == 1) {
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hash = hash_djb2_one_32(
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(uint32_t)OS::get_singleton()->get_ticks_usec());
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hash = hash_djb2_one_32(
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(uint32_t)OS::get_singleton()->get_unix_time(), hash);
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hash = hash_djb2_one_32(
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(uint32_t)OS::get_singleton()->get_data_dir().hash64(), hash);
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/*
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hash = hash_djb2_one_32(
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(uint32_t)OS::get_singleton()->get_unique_id().hash64(), hash );
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*/
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hash = hash_djb2_one_32(
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(uint32_t)((uint64_t)this), hash); //rely on aslr heap
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hash = hash_djb2_one_32(
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(uint32_t)((uint64_t)&hash), hash); //rely on aslr stack
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hash = hash & 0x7FFFFFFF; // make it compatible with unsigned, since negatie id is used for exclusion
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}
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return hash;
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}
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int NetworkedMultiplayerENet::get_unique_id() const {
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ERR_FAIL_COND_V(!active, 0);
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return unique_id;
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}
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void NetworkedMultiplayerENet::set_refuse_new_connections(bool p_enable) {
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refuse_connections = p_enable;
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}
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bool NetworkedMultiplayerENet::is_refusing_new_connections() const {
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return refuse_connections;
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}
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void NetworkedMultiplayerENet::set_compression_mode(CompressionMode p_mode) {
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compression_mode = p_mode;
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}
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NetworkedMultiplayerENet::CompressionMode NetworkedMultiplayerENet::get_compression_mode() const {
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return compression_mode;
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}
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size_t NetworkedMultiplayerENet::enet_compress(void *context, const ENetBuffer *inBuffers, size_t inBufferCount, size_t inLimit, enet_uint8 *outData, size_t outLimit) {
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NetworkedMultiplayerENet *enet = (NetworkedMultiplayerENet *)(context);
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if (size_t(enet->src_compressor_mem.size()) < inLimit) {
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enet->src_compressor_mem.resize(inLimit);
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}
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int total = inLimit;
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int ofs = 0;
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while (total) {
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for (size_t i = 0; i < inBufferCount; i++) {
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int to_copy = MIN(total, int(inBuffers[i].dataLength));
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copymem(&enet->src_compressor_mem[ofs], inBuffers[i].data, to_copy);
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ofs += to_copy;
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total -= to_copy;
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}
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}
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Compression::Mode mode;
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switch (enet->compression_mode) {
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case COMPRESS_FASTLZ: {
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mode = Compression::MODE_FASTLZ;
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} break;
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case COMPRESS_ZLIB: {
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mode = Compression::MODE_DEFLATE;
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} break;
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case COMPRESS_ZSTD: {
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mode = Compression::MODE_ZSTD;
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} break;
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default: { ERR_FAIL_V(0); }
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}
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int req_size = Compression::get_max_compressed_buffer_size(ofs, mode);
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if (enet->dst_compressor_mem.size() < req_size) {
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enet->dst_compressor_mem.resize(req_size);
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}
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int ret = Compression::compress(enet->dst_compressor_mem.ptr(), enet->src_compressor_mem.ptr(), ofs, mode);
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if (ret < 0)
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return 0;
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if (ret > int(outLimit))
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return 0; //do not bother
|
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copymem(outData, enet->dst_compressor_mem.ptr(), ret);
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return ret;
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}
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size_t NetworkedMultiplayerENet::enet_decompress(void *context, const enet_uint8 *inData, size_t inLimit, enet_uint8 *outData, size_t outLimit) {
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NetworkedMultiplayerENet *enet = (NetworkedMultiplayerENet *)(context);
|
|
int ret = -1;
|
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switch (enet->compression_mode) {
|
|
case COMPRESS_FASTLZ: {
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|
|
|
ret = Compression::decompress(outData, outLimit, inData, inLimit, Compression::MODE_FASTLZ);
|
|
} break;
|
|
case COMPRESS_ZLIB: {
|
|
|
|
ret = Compression::decompress(outData, outLimit, inData, inLimit, Compression::MODE_DEFLATE);
|
|
} break;
|
|
case COMPRESS_ZSTD: {
|
|
|
|
ret = Compression::decompress(outData, outLimit, inData, inLimit, Compression::MODE_ZSTD);
|
|
} break;
|
|
default: {}
|
|
}
|
|
if (ret < 0) {
|
|
return 0;
|
|
} else {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
void NetworkedMultiplayerENet::_setup_compressor() {
|
|
|
|
switch (compression_mode) {
|
|
|
|
case COMPRESS_NONE: {
|
|
|
|
enet_host_compress(host, NULL);
|
|
} break;
|
|
case COMPRESS_RANGE_CODER: {
|
|
enet_host_compress_with_range_coder(host);
|
|
} break;
|
|
case COMPRESS_FASTLZ:
|
|
case COMPRESS_ZLIB:
|
|
case COMPRESS_ZSTD: {
|
|
|
|
enet_host_compress(host, &enet_compressor);
|
|
} break;
|
|
}
|
|
}
|
|
|
|
void NetworkedMultiplayerENet::enet_compressor_destroy(void *context) {
|
|
|
|
//do none
|
|
}
|
|
|
|
void NetworkedMultiplayerENet::_bind_methods() {
|
|
|
|
ClassDB::bind_method(D_METHOD("create_server", "port", "max_clients", "in_bandwidth", "out_bandwidth"), &NetworkedMultiplayerENet::create_server, DEFVAL(32), DEFVAL(0), DEFVAL(0));
|
|
ClassDB::bind_method(D_METHOD("create_client", "ip", "port", "in_bandwidth", "out_bandwidth"), &NetworkedMultiplayerENet::create_client, DEFVAL(0), DEFVAL(0));
|
|
ClassDB::bind_method(D_METHOD("close_connection"), &NetworkedMultiplayerENet::close_connection);
|
|
ClassDB::bind_method(D_METHOD("set_compression_mode", "mode"), &NetworkedMultiplayerENet::set_compression_mode);
|
|
ClassDB::bind_method(D_METHOD("get_compression_mode"), &NetworkedMultiplayerENet::get_compression_mode);
|
|
ClassDB::bind_method(D_METHOD("set_bind_ip", "ip"), &NetworkedMultiplayerENet::set_bind_ip);
|
|
|
|
BIND_ENUM_CONSTANT(COMPRESS_NONE);
|
|
BIND_ENUM_CONSTANT(COMPRESS_RANGE_CODER);
|
|
BIND_ENUM_CONSTANT(COMPRESS_FASTLZ);
|
|
BIND_ENUM_CONSTANT(COMPRESS_ZLIB);
|
|
BIND_ENUM_CONSTANT(COMPRESS_ZSTD);
|
|
}
|
|
|
|
NetworkedMultiplayerENet::NetworkedMultiplayerENet() {
|
|
|
|
active = false;
|
|
server = false;
|
|
refuse_connections = false;
|
|
unique_id = 0;
|
|
target_peer = 0;
|
|
current_packet.packet = NULL;
|
|
transfer_mode = TRANSFER_MODE_RELIABLE;
|
|
connection_status = CONNECTION_DISCONNECTED;
|
|
compression_mode = COMPRESS_NONE;
|
|
enet_compressor.context = this;
|
|
enet_compressor.compress = enet_compress;
|
|
enet_compressor.decompress = enet_decompress;
|
|
enet_compressor.destroy = enet_compressor_destroy;
|
|
|
|
bind_ip = IP_Address("*");
|
|
}
|
|
|
|
NetworkedMultiplayerENet::~NetworkedMultiplayerENet() {
|
|
|
|
close_connection();
|
|
}
|
|
|
|
// sets IP for ENet to bind when using create_server
|
|
// if no IP is set, then ENet bind to ENET_HOST_ANY
|
|
void NetworkedMultiplayerENet::set_bind_ip(const IP_Address &p_ip) {
|
|
ERR_FAIL_COND(!p_ip.is_valid() && !p_ip.is_wildcard());
|
|
|
|
bind_ip = p_ip;
|
|
}
|